Shimano, Rear Derailleur, Rd-M3100, Alivio, Sgs 9-Speed, Top Normal, Shadow Design, Direct Attachment

The Shimano Alivio RD-M3100-SGS is a 9-speed rear derailleur featuring Shimano's low-profile SHADOW design for more aggressive riding with fewer interruptions; it offers a total capacity of 45T and a maximum low sprocket capacity of 36T; an adjustment barrel is included for fine-tuning shifting performance; and it uses a direct attachment; top normal design.